Remote inputs to IoTaWatt

I am about to set up an IoTaWatt which will be located at the main input/output of the property (garage). The solar inverter is also here so I will be able to easily log total imports, total exports and solar generation.

The house, and all its separate circuits, is over 20m away from this point. I am currently working to get the network with wifi coverage extended to the IoTaWatt location.

My challenge is to get separate circuit inputs (CTs) connected to the IoTaWatt. I would like to see individual contributions from at least the HWS and heat pump heater which are my biggest consumers. A separate IoTaWatt instance seems untidy but I am not seeing too many options.

Does anyone have any suggestions for using circuit level sensors in a different building?

Twenty meters is a long way. Separate units is one solution.

Extending with CAT6 wire is a possibility, although you would need to do some electrical work to adapt the 3.5mm jacks at each end. I think it would work OK, although I haven’t tried that length the math says it’s only 4 ohms so shouldn’t be a problem. It would also depend on what kind of conduit you have between the two. You should not run it through a high-voltage conduit.

The CAT6 has four twisted pairs, so you can extend four CTs with one run. I would recommend you put the IoTaWatt in the house and extend to the garage to pick up the inverter and any load center you may have in the garage.

I’m yet to dig the trench and run the network cabling but I had already decided to run an extra Cat6 cable (or perhaps two). 20m distance will quickly blow out to 30 once I thread it around walls and over roof trusses.
My preference is to commission the unit in the garage and then enhance its value with refined inputs when time and motivation permits. If I add inputs later, it will be building on an already stable system which should make troubleshooting so much easier.
If I commission it in the house, I need to have the complete solution including long CT runs before I see any data flowing.
I was really looking for the lazy option but I guess that nothing worthwhile comes cheap.

That should be fine. Install in the garage and move it later.